Python

clear() method in list

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clear() method in list - Python

This method is used to remove all elements from a list.

The .clear() method doesn’t take any argument and it doesn’t return anything.

When we call this method with an empty list then it doesn’t give any error.

When we call this method with a list it will traverse each element, removes the reference of each element from the list and make the length of the list 0.

The time complexity of this method is O(n) where n is the number of elements in the list.

This method is useful when you want to reset your list or you want to reinitialize the list.

Syntax –

list.clear()

Parameters –

argument → Doesn’t take any argument.

return → None(doesn’t return anything).

Example 1-

				
					my_list=[5,10,15,20,25,30]
print("Original list:",my_list)
my_list.clear()
print("Original list after clear:",my_list)

# Output -
# Original list: [5, 10, 15, 20, 25, 30]
# Original list after clear: []

In the above example, first we create a list with some elements and store it in my_list variable.

After creating my_list print the list on the output screen.

Then call the .clear() method with the my_list.

Finally, print the modified original list on the output screen.

Example 2- Clear an Empty list

				
					lst=[]
print("Original list:",lst)
lst.clear()
print("Modified original list:",lst)

# Output -
# Original list: []
# Modified original list: []

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